A1 Bulgaria
a1.bg
Actively hiring
Broadband
Mobile Networks
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Overview
A1 Bulgaria is a telecommunications operator offering mobile and fixed services, the latest smartphones and devices, as well as digital, business and financial services, with online purchasing. Its Competence Delivery Center in Sofia hires AI architects, site reliability engineers, cloud optimization engineers, QA engineers and software asset management leads to support the group's operations. The company is headquartered in Sofia, Bulgaria.
Tech stack
Technologies named in job postings at A1 Bulgaria over the last 12 months, by layer, with the share of postings for each.
Technologies in use
151
Postings analysed
40
Stack modernity
83/100AI adopter
Languages
Python45%
SQL30%
JavaScript18%
Java10%
Frameworks & libraries
OpenTelemetry15%
Playwright8%
Angular5%
Hadoop5%
Databases
MS SQL8%
PostgreSQL8%
MySQL3%
Redis3%
Cloud & platforms
Kubernetes33%
Azure30%
Grafana20%
Linux15%
AI & ML
LLM8%
LoRA3%
PEFT3%
QLoRA3%
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Full A1 Bulgaria tech stack
151 technologies · by team · pay by technology · changes · similar stacks
Growth
Hiring Momentum
41/100
Stable
Open positions
50
10 opened / 0 closed in 30 days
Median time-to-fill
8 days
faster than 73% of the market
Hiring Dynamics
0%
Hiring Focus
The percentage next to each role is its share of the company's job openings over the last 90 days; the arrow shows the shift versus the previous period.
DevOps
21% ▲
Backend
9% ▲
Industrial Engineering
9% ▲
Data Science
8% ▲
Analytics
8% ▲
Security
6% ▲
Actively hiring for DevOps (+11 in 30 days)
Activity Timeline
+10 jobs in a week
Oct 2026
Offices
Where the company hires and what each office is for
Cities
1
Hiring now
1
Countries
1
Busiest office
Sofia
Sofia
Bulgaria
HQ
47 open roles 47 posted in 90 days 66% engineering
hires for DevOps, Backend, Data Science
Jobs
≈ $29k – $80k per year (Estimated) • Hybrid • Sofia
Python
Django
DevOps
Linux
Apply
Apply
≈ $38k – $88k per year (Estimated) • Hybrid • 3+ years exp • Sofia
ISO 27001
GDPR
Apply
≈ $35k – $92k per year (Estimated) • In office • 3+ years exp • Sofia
Model Context Protocol
AI Agents
LLM
RAG
Context Engineering
DevOps
Azure
Apply
≈ $25k – $65k per year (Estimated) • In office • 1+ year exp • Sofia
Python
SQL
Databricks
AI/ML
Spark
MLFlow
Scikit-learn
Prompt Engineering
TensorFlow
Pandas
NumPy
PyTorch
Machine Learning
DevOps
Git
Docker
GitHub
Analytics
Tableau
Power BI
Seaborn
Matplotlib
Management
Jira
Agile
Scrum
Apply
≈ $29k – $74k per year (Estimated) • In office • Sofia
JavaScript
Java
TypeScript
SQL
Maven
Hibernate
Frontend
Angular
Bootstrap
PrimeNG
DevOps
Rest API
Jenkins
Git
SOAP
Management
Confluence
Jira
ServiceNow
Apply
≈ $29k – $79k per year (Estimated) • In office • Sofia
Python
JavaScript
TypeScript
OpenTelemetry
GitOps
ArgoCD
Kubernetes
Grafana
QA
Playwright
k6
Apply
Hybrid • Internship • Sofia
CI/CD
Git
Apply
In office • 1+ year exp • Sofia
Incident Management
Windows
Apply
≈ $39k – $91k per year (Estimated) • In office • 3+ years exp • Sofia
Tableau
Power BI
Apply
Hybrid • Internship • 1+ year exp • Sofia
Python
JavaScript
SQL
GitHub Actions
CI/CD
Jenkins
Git
GitHub
Management
Jira
QA
Selenium
Cypress
Playwright
Swagger
Postman
Apply
≈ $30k – $75k per year (Estimated) • In office • Sofia
C#
ASP.NET Core
Databases
PostgreSQL
Redis
ActiveMQ
MS SQL
DevOps
Rest API
Docker
Kubernetes
Apply